1840s
- 1849 – John Ruskin's The Seven Lamps of Architecture is published.
- 1848 – Construction begins on the Washington Monument in Washington, D.C., though it will not be completed until 1885.
- 1847 – 24 August, birth of Charles Follen McKim (died 1909).
- 1846 – 4 September, birth of Daniel Burnham of the firm Burnham and Root.
- 1845 – Trafalgar Square in London, designed by Charles Barry and John Nash, is completed.
- 1844 – Uspensky Cathedral in Kharkiv, Ukraine is completed.
- 1843 – Construction begins on Henri Labrouste's Bibliothèque Sainte-Geneviève in Paris.
- 1842 – The Église de la Madeleine is finally consecrated in Paris as a church.
- 1841 – Birth of Otto Wagner.
- 1840 – Construction begins on the Houses of Parliament in London, designed by Sir Charles Barry and Augustus Welby Northmore Pugin.
Read more about this topic: Timeline Of Architecture